Open document not visible

[cath27]

I have used Indesign for years, but this past month I have had this issues multiple times with different documents. When I open a document - either by double clicking the document file or by going to file>open, the program "window" menu says it is open, but it is not visible. This happens with all documents I try to work on. Restarting the program does not help. I have to restart my computer (Macbook running High Sierra)  before I can see the document. Any idea what is going on?

[Eugene Tyson]

No worries.Thanks for getting back to me.